Thermostatic controlling device



Sept. 24, 1940. J. K. LUND THERMOSTATIG CONTROLLING DEVICE Filed Ma 7, 1937 17274672507" Jamefi 161247305 Patented Sept. 24, 1940 PATENT OFFICE 2,216,015 THERMOSTATIC CONTROLLING DEVICE JamesK. Lund, Oak Park, 111., assignor to The Dole Valve Company, Chicago, 111., a corporation of Illinois Application May 7, 1937, Serial No. 141,330

4 Claims.

engine wherein the function of pressure and temperature takes place below the casing flange.

The invention has further objects which are more particularly pointed out in the accompanyingdescription.

- Referring now to the drawing,

Fig. 1 is a view showing one form of device embodying the invention in position in the circulatory cooling system of an internal combustion engine;

Fig. 2 is an end view of the valve shown in Fig. 1; and

Fig. 3 is a sectional view taken on line 3--3 of Fig. 2.

Like numerals refer'to like parts throughout the several figures. Referring now to the drawing, I have illustrated a radiator I of an internal combustion engine, which is connected by a pipe 2 with the coolingjacket 3 of the internalcombustion engine. Mounted in the connection between the cooling jacket 3 and the radiator I is a valve 4. This valve is provided with a casing 5 having at its upper end a laterally extending flange 6. This flange is preferably received between the end of the pipe 2 and the engine jacket 3, as shown in Fig. 1, and is clamped in position by means of the bolts 1. The flange 6 is at the upper end of the 40 casing.

Pivotally mounted in the casing is a valve 8, which is pivotally mounted at 3 in the casing, so that it may be moved to open and close it. A thermostatic device Ill has one end I I connected 4:; with a fixed part 12 attached to the casing 5. The other end of the thermostatic device-is con nected with the valve 8. As herein shown, this connection is made by means of a link 13 to which one end of the thermostatic device is pivotally connected at H. The other end of the'link is pivotally connected at IS with an enclosing housing 16 attached to the valve.

A baflle I1 is connected with the casing 5 above the valve and is inclined downwardly toward the by a small space. 'The casing is provided with a bleed hole l8 located between the end of the valve when closed and the battle I1. It will be noted that the baffle, andthe valve, and the bleed hole, as well as the thermostatic device, are all located below the flange 6, so that the entire function of pressure and temperature takes place below the casing flange 6.

The -use and operation of my invention are as follows.

When the valve is in position, as shown in Fig. 1, and the engine is started up, the engine is cool and the valve 8 is closed. The pressure due to .the pump causes a certain amount of liquid to pass through the bleed hole l8 and between the bafile I1 and the valve 8 and up into the pipe above said valve and thence to the radiator. The parts are so constructed that the bleed hole liquid and the leakage around the valve should not be more than three gallons per minute.

The'pressure on the lower side of the valve 8, due to the pump, tends to produce a friction on the pivots, which makes it more difficult for the thermostatic device to move the valve to open it. The liquid passing through the bleed hole to the other side of the valve tends in a small measure to reduce this friction at the very starting of the opening of the valve. When the valve starts to open, the liquid passing between the valve and the casing strikes the baflle I1 and is deflected by the baflle so as to strike the upper part of the valve 8 and tends to assist the thermostatic device in opening the valve. Since in this construction the baflle and the valve and the bleed hole and the thermostatic device are all below the flange 6 of the casing, they are all within the pressure and temperature area at all times and the entire function of pressure and temperature takes place below the casing flange. In this construction the liquid pressure referred to is the hydrostatic pressure head existing or caused to exist in the water jacket of the engine due to the water circulating pump. The liquid temperature is the temperature of the water surrounding 'or in the immediate vicinity of the thermostatic bimetal element, which actsthereon and which when it reaches a predetermined amount, causes the thermostatic element to move the valve. The water jacket of the engine is the so-called high pressure chamber and the radiator and connection from the jacket beyond the valve is the so-called low pressure chamber of the cooling system. The pressure difference of the hydrostatic pressure existing in the so-called high and low pressure chambers of the. cooling system depends upon the amount of valve opening and the pump speed. When the thermostatic valve is fully open, the hydrostatic pressure between the two chambers is practically equalized and when the thermostatic valve is fully closed, the hydrostatic pressure difference between these two chambers is a maximum. This maximum pressure condition creates a maximum friction on the valve shaft which 'must be' overcome before the valve will start to open. This inherently means the start to open temperature of the thermostat will vary with the pressure conditions. Hence to improve the opening performance of the thermostat means for neutralizing or compensating for shaft friction must be incorporated to function automatically 'withchanges in pressure, so as to permit the valve to open at substantially the same temperature, regardless of pressure. The dynamic force of the liquid passing through the bleed hole and-impinging on the valve accomplishes this result in an automatic mar ner. The greater the hydrostatic pressure, the greater is the dynamic force of the liquid impinging upon the valve.

This makes it possible to provide a construction which is more efficient, more adaptable and produces moresatisfactory'results than has heretofore been possible with valves of this type,

and this is particularly true in connectionwith circulatory cooling systems which have compar- I -atively high pressures. This constructionalso permits the radiator and connections to be filled with the cooling liquid before the engine tema perature is reached which causes the opening of the valve.

I-claim:

1. A thermostatic controlling device for the circulatory cooling systems of internal combustion engines, having a high pressure chamber and a 40 lowpressure chamber, comprising "a casing, a

flange for said casing by means of which it isheld in position, a valve pivoted in said casing-for controlling the passage of liquid through the easbelew the battle the temperature'reaches, a predetermined point, to open the valve, said valve casing beinglocated in the high pressure chamber, said opening communicating with the high pressure chamber and lthe space between said battle and the face of the valve in the low pressure chamber, so that the pressure in the high pressure chamber is utilized to assist thethermostat in'opening the valve.

2. A thermostatic controlling device for the circulatory cooling systems of internal combustion engines, having; a high pressure and alow pressure chamber,- comprising a casing, a valve pivotally mounted in said casing for controlling the passage of liquid through the casing, a baflie on the interior of said casing above said valve, an opening in the casing below the bailie and above said valve, a thermostatic device connected with said valveso as to move it when the temperature reaches a predetermined point, and means for fastening said casing in the circulatory system of the engine, so that the said baiiie, opening, valve and thermostatic device are at all times subjected to the pressures and temperatures in the engine cooling jacket, said opening communicating with the high pressure chamber andv the space between said baiiie and the face of the valve in the low pressure chamber, so that the pressure in the high pressure chamber is utilized to assist the thermostat in opening the valve, whereby the valve is opened at substantially the temperature for which the thermostat is set, regardless of the pressure in thehigh pressure chamber.

'3. A thermostatic controlling device for the circulatory cooling systems of internal combustion engines, having a low pressure chamber and a high presure chamber comprising a casing, a

valve pivotally mounted in said casing, a bailie on the interior of said casing above said valve, an opening inthe casing intermediate the baflie and the valve, a thermostatic device connected with said valve so as to move itwhen the temperature reaches a predetermined point, the portion- I of the casing containing the bailie, opening, and

valve being located in the high pressure chamber, said opening connecting the space between the beille and the faceof the valve in the lowpressure chamber with the high pressure chamber, so that variations in pressure in the high pressure chamber are automatically utilized to? provide an opening pressure on the valve, whereby the valve 'is opened at substantially the temperature for which the thermostat is set,regardless of the pressure in the high pressure cham- A thermostatic controlling device for the circulatory cooling system of an internal combustionenginehavingahigh ressureareaauda low-pressure the pressure in the high pressure area to the' low pressure side of said valve when it is closed and before it starts to open.

. sums x. Lmm,

area when the engine is started upcold, comprising a valve which separates the low I 

